Call dll ActiveX in Labview

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• call dll driver in labview exe

  I have an instrument driver in LabVIEW.  The driver still functions call a DLL in instr.lib through the call library function.  When I compile an exe file that uses the driver functions, where should I put this DLL?  He would be allowed to compile the DLL in the exe?  If it's ok, how it works, because the driver get the DLL in instr.lib?  Thank you!

  You can not choose the exe as a destination of the DLL. Yes, the DLLS are located in the folder data.

• Efficiency call DLLS in Labview

  Hello

  I'm working on a labview program for the treatment of the data in real time.  Thus, code running efficiency will be critical.  I wonder how about the cost of calling DLLs.  Similarly, what the call cost of the subprogrammes.

  To implement the same function, the call of a Subvi will be faster than calling a DLL?

  If I can develop all screws Sub in the main program and delete all the calls, which will be much faster?

  Can someone give me any clue or guideline?

  Thank you.

  CRXX wrote: [...]

  I'm working on a labview program for the treatment of the data in real time. [...]

  What is the OS you are using?

  Since you ask in general, I answer in general:

  This question cannot be ansered. This is a case-by-case-thing and must be assessed individually.

  Most of the effect will be the memory management: which allocates the amount of memory? When it's done?

  Memory of ESP. allocation mess up determinism, if a DLL can perform worse than pure code LV (given a BONE of RT LV). But it might be preferable for some algorithms encapsulated... no one can say in general.

  Perhaps the most important question is:

  How many times is that the code (DLL vs Sub - VI) called and how short is its runtime? If the load of execution: calling code relationship is very low (-online 1:1), it is best to "solve" the subcode. SubVI Inling is a valid way in pure BT (from 2010).

  If the code is called rarely, this whole discussion is somehow obsolete as the overload of calls will be negligible, even if it would be quite high...

  And no, C is not faster as LV by definition. It also depends on the task and how you implement it...

  hope this helps,

  Norbert

• Error 1097 when calling DLLS in LabView

  I get an error 1097 when calling the LabVIEW provider library. Curiously, the error, the DLL routines still seem to do what is asked of them.  This is the test code.  It opens an Ethernet connection to a controller of axes Galil, he asks (possibly) the value of its internal clock, and then closes the connection.  Each call library function returns error 1097 but "valve function" I32 error number is always zero. Open function causes the connection to be opened, the command function causes the send command and receives a reasonable answer, narrow funtion seems to cause the connection to be closed.

  

  Here is what I see when I run the test:

  

  Also directly configure call-library functions, as I did in this VI, I also tried using the import-shared-library Wizard to create a vilib of functions of the DLL and I get the same behavior and errors when I use these functions.  I tried to tweak some of the data types in my configured manually call library functions to see if I could find a combination that worked better with the library, but had no luck there.

  I use the x 86 version of the DLL with v2014 LabVIEW 32-bit on a 64 bit windows system 7.  I see that the error on the two computer systems of different work configured in this way. I see a similar error on a home computer with just the RTE of 2014 installed. The manufacturer says they can not reproduce the error. I always saw the error over multiple versions of their library DLL.

  In the attachment ZIP it has a link to the DLL library on the manufacturer's website. There is also a copy of the VI, the DLL and a large part of how-to-use documentation that accompanies the DLL.

  I was hoping that someone who was familiar with the use of the call-library function might take a peek at what I do and see if an error could be spotted.

  Unable to find an error, I did, I would be happy to suggestions on how I could solve this. Little seems to me like there may be a problem with the library. The manufacturer, Galil, said that they have opened a log with OR to see if NEITHER could help but since Galil said they can not reproduce the problem and provide an example of the NC, it really went anywhere.

  Given the decoration of symbol names as exported by the DLL I "m convinced that you must change the stdcall calling convention.

• LabView crashes after calling DLL

  Hello

  I'm working on a library that makes calls to the other dll, which is linked dynamically.

  I have to do this, customize the DLL search order before the call and add a few custom directories (where are the dll called).

  The called code works very well, and doesn´t in the DLL called memory leak, however LabView is suspended.

  It took me a long time to understand this, so I hope this helps someone in the future. Below is the solution.

  LabView uses its own research agenda DLL, so beware of assistance call "SetDefaultDllDirectories" regarding the whole process and LabView DLL management function will burst.

  Allways avoid using flags in the LoadLibraryEx.

• Call the function in LabView from a DLL, and then access the global variable of DLL

  I've created a DLL in LabWindows with a function and structure.  I want to call the function from LabView and then access the overall structure.  I am able to call the function in the DLL with a "call library function node" and has access to the return value, but I can't understand how to access the overall structure.  The structure is declared in the header DLL with __declspec (dllimport) struct parameters file.

  Is it possible to access this structure without using the library of network variables?

  My guess is that you need two bytes of padding after "in_out" and another to two bytes of padding after "anin."  The reason being that ints are 4 bytes, and most of them C compilers will align on 4-byte boundaries.  The struct will naturally start to such a limit (in fact, in Windows, it will probably start to an 8 byte boundary).  If you then count bytes in your structure, you are 70 byte after "in_out."  70 is not divisible by 4, so you need 2 bytes more to reach the next 4 byte boundary.  You can also you could reorganize your struct so that "anin" follows "in_out" and this is probably the best option if it won't cause you other problems.

  Unlike most C compilers, LabVIEW compressed structures as closely as possible, without filling.  I don't know enough about the history of LabVIEW and internal parts to explain the reasons and to do this performance penalty, but, as choice of LabVIEW "endianness", it is probably a remnant of the first versions of LabVIEW that were running on the Mac.

  If for some reason you want to force your C struct to match package LabVIEW, you can use the #pragma pack (x) directive, but I wouldn't recommend that here because you can control the C and LabVIEW.

  EDIT: in the cases where it was not clear, add padding to your cluster of LabVIEW, insert appropriate size or items at the place desired in the cluster.

• Call a dll built with Labview in Digital Micrograph

  Hello everyone,

  I am faced with a difficult problem. I use Digital Micrograph that run the DLL of enforcement. This DLL must be built with a structure of library written in C. In this C code, I can call a built with Labview VI. If the Vi is simple, Digital Micrograph is happy. But, if I include a graph in the VI, C code builds and create a dll but Digital Micrograph falls down. Of course, DM is unclear the type Labview graph. I can do what I want in my VI and how can I solve the problem?

  Thank you.

  Gautier

  gautierdufourcq wrote:

  I solved part of the problem, DM do not plant more but the Labview graph is not displayed. Do you have a solution? THX

  Is not a problem of LabVIEW.

  It's their DLL. Talk to DM.

• call dll issue

  Hello

  now I need to call a dll named SajetConnect.dll, this dll will create logfile and ini file automatically when I call.

  Attached VI call this dll, there is no log file and ini file created, but the exe file that I'm building this VI work well for her.

  I also call thie dll using c# and it still work fine.

  So it seems that some path setting question went from me, thanks for your help to take a look for my trouble, thank you!

  attached list

  2. without title vi VI

  New Folder\123\Application.exe create JOURNAL SAJET. INI SajetConnect.ini when you run this exe to call DLLs

  Without seeing the source code of the DLL there is very little we can do, but shooting in blue. And I have no balls to spare in this at the moment, except maybe the DLL tries to create these files in the directory where the executable. This would be the directory where the labview.exe deveopment environment. But given that Windows Vista users don't have write access to this directory more. Some features of the INI file are virtualized in these versions of Windows and redirected to a specific shade of the user location, but only if your application uses files INI of Windows API functions. Otherwise write access fails just and you won't see them unless you manage these errors in some way and proceed to the appellant.

• can I create a DLL file for labview that has DLL library with inside?

  Hello everyone,

  I am developing an application for the cards PCI devicenet in labview (beginner to labview) environment.  Is there a DLL file for the PCI card from the provider. But it's too complicated for a beginner to call each function in the DLL of labview. Therefore, I'm trying to re - use a VC ++ program (working properly) that calls some sellers DLL library functions.    To do this, I created the DLL file which includes all headers and libraries the provider DLL, as indicated in the attached figure. But I couln can't see the effect on the device. is it possible to create a DLL file for labview that has DLL library with inside? If this is not the case, how can I implement the program shown in figure?

  I would like to wish a huge as to advance.

  It is not something I have a lot of experience in so I don't know all the details of the restrictions or requirements etc - but it is certainly possible to create wrappers for the dll and then use them in LabVIEW - this is sometimes necessary to convert some native types/data structures in C/C++ into something that you can switch to your other DLL LabVIEW.

  There is a link here: http://digital.ni.com/public.nsf/allkb/06ECDC689DDA0F3D862574440074CD95

• Call Assistant DAQ of Labview code

  Hello

  How can I call the DAQ Assistant dialog box

  

  from Labview code, as well as a program compiled with Labview runtime?

  Now, I can set the Express Assistant DAQ vi in the block diagram, but cannot be changed during execution.

  But the configuration of data acquisition is not static. The end user must change.

  A similar dialogue is used inside the Measurement & Automation Explorer with a task global DAQmx.

  Can I call this dialog of Labview?

  Peter

  There is a way to call the DAQ Assistant of MAX of Labview code to create or modify a task DAQmx: Screw Wizard DAQmx LabVIEW

• Can we call library user directly labview vi in teststand?

  Hello

  I'm calling one of the libraries of the labview teststand user directly. I get errors when running (Catpure.png attachment).

  If I create labview file and use this library vi in labview with same entries that then use this labview in teststand, and teststand is happy (capture2.png, capture3.png).

  I would like to know if I can call library user directly labview vis in teststand or should have create my own vi call this lib from there? Can someone let me know?

  Kind regards

  Hema

  Hi Hema,

  In general, screw calling for a Bachelor's degree in LAW (LabVIEW library) TestStand works very well. I have attached a sequence that makes calls to a VI in a Bachelor's degree in LAW and a VI out of one. This works as expected.

  The error you get is probably the result of another problem. Please add more details about the error, the versions TestStand and LabVIEW, you use and if you have set the LabVIEW LabVIEW RunTimeEngine adapter or LabVIEW Development System.

  PS: The image you attached shows the setting for the call of VI step and it seems to be loading fine (no provider indicating a loading error error). If the step throws an error only when executed, then attach a snapshot of the error dialog box that is displayed or the report that has the details of the error.

• Python, call DLLs in LabVIEW: Fatal internal error when accessing output String Cluster

  Hello

  We have compiled a DLL in LabVIEW (TestError.dll) and tried to call it from Python.

  TestError.dll includes 2 functions:

  1 testErreur: cluster 1 entry string, 1 channel indicator

  2 TestError2: 1 channel input, 1 bunch of output string

  What we try to do in Python is actually something like this:

  1 provide values to controls in the functions of the DLL.

  2. call the DLL.

  3 get the values of the indicators.

  What we have seen are:

  1 read/write operations on normal data types (string, digital) indicators/controls are OK

  2. write operation on the Cluster string entry is OK

  3. read operation on the Cluster output string is not OK. The following error is still prompted for:

  «Unrecoverable internal error: 'MemoryManager.cpp', line 437.» LabVIEW version 8.6... »

  Also joined the TestError.prj and python code.

  Grateful if someone can help to explain why we get this error and how to overcome?

  Thank you

  howmean

  What we have seen are:

  1 read/write operations on normal data types (string, digital) indicators/controls are OK

  2. write operation on the Cluster string entry is OK

  3. read operation on the Cluster output string is not OK. The following error is still prompted for:

  «Unrecoverable internal error: 'MemoryManager.cpp', line 437.» LabVIEW version 8.6... »

  Also joined the TestError.prj and python code.

  It is very logical that it does not, and the bad news is, it cannot really be implemented reliable of a process not LabVIEW.

  LabVIEW channels (and tables) are very specific species. They are then called handles, which are pointers to a pointer to a block of memory. If you have a control or indicator on its own, the Prototype configuration allows you to configure this setting as a C. LabVIEW data pointer, when creating the DLL, create heels C for each exported function and place the code to do the translation between the past C pointer to and necessary LabVIEW data handle. For strings and arrays within the cluster, there is no configuration option and the DLL is expected to pass a structure with data handles native LabVIEW in there.

  You may say that creating handles data in your calling process enough to trick LabVIEW. For the input variables that actually CAN sometimes work (but is a delicate and dangerous generally to handle this). There is no way to make it work for output variables. LabVIEW will try to resize handle to fill data in that he wants to make. This resizing is done using internal memory manager of LabVIEW. This will work only if it had been allocated by EXACTLY the same instance of the memory manager. Otherwise, it refers to a different memory segment and catastophally fail. The only way to make this work perhaps, with luck, taking your heart and prayer to the gods, is to lvrt.dll to allocate a handle that you must pass to the DLL. Still find the good lvrt.dll, which will execute your DLL LabVIEW is a major challenge.

• Calling DLLS in LabVIEW

  Hello

  Below is the code written in LabWindows in which dynamically access a Dll using Windows API LoadLibrary(), GetProcAddress(), and FreeLibrary().

  Successfully, I could load the library and get the procedure address using library calls node in LabVIEW. But got stuck after that.

  As I am not good in C/C++ coding, ask someone to really help me to write the same thing in LabVIEW.

  Kindly do the needful.

  #include   // Function prototypes.
  #include     // CVI Active X definitions.
  #include 
  #include    /* Needed if linking in external compiler; harmless otherwise */
  #include 
  #include 
  
  typedef long __stdcall( *OLECREATEOBJECT)(char*);
  static  HINSTANCE  Hinstlib;
  static  long  gvntISystem;
  
  long CviCreateFastObjects (void)
   {
  OLECREATEOBJECT procAdd;
      pStrTempmem      = (char*)CA_AllocMemory(1);
      Hinstlib = LoadLibrary("FastTrio");
      if( Hinstlib != NULL)
  {
          procAdd = (OLECREATEOBJECT) GetProcAddress(Hinstlib, "OLECreateObject");
          if(fRunTimeLinkSucess = (procAdd != NULL))
  {
          gvntISystem = (procAdd)("FAST.IMFASTSystemInterface");
          return 0;
          }
          else
          return 1;
          }
      else
          {
  return 1;
          }
  }
  

  All the information you need are in the C code.

  • OLECREATEOBJECT is typedefed just after all the #includes at the top.  It returns a long integer (typically I32 in LabVIEW, but could be I64 on a 64-bit operating system) and takes a string as input.  It uses the standard windows calling conventions, not the C calling convention.
  • LoadLibrary and GetProcAddress are used to get a pointer to the function (procAdd).  This is handled in LabVIEW, by filling in the location of the library and the function in the call library node.
  • The library of appeal in LabVIEW node must also be set to the standard calling convention and return value (I32) and list of parameters (a string) must be set.
  • the function is used to set gvntISystem with a constant of entry 'FAST. IMFASTSystemInterface ".  In LabVIEW, a constant string of wire at the entrance and read the return value.
  • You can implement the audit, thus using the call library errors node error output.

  Good luck!

• LabVIEW call DLLs Visual Studio - error - "Debug Assertion Failed"

  Dear Forum,

  I made the wrappers for the c codes ++ writing Visual Studio 2008 for some time. I recently worked with a c++ application.

  However, this time, I get an error expected. Alien, the code calls the dll worked previously. With no retouching, I closed LabVIEW for a few hours, it opened again - and this error message (see below) appeared since. I tried to restart the computer, the Subvi rewriting and checking the prototype of the function.

  Nobody knows what this assertion of debugging message failed try to indicate?

  

  It seems that when I run the LabVIEW VI when it calls the node library call. It does not return and error boolean as designed in c++ code.

  Note: All other containers of c ++ and LabVIEW code works, but not this one.

  Any advise would be very useful indeed.

  Kind regards

  James

  Hi all

  I have now solved the problem I had.

  The dll must be in the same location as the config file a dependency.

  Van

  James

• Need help with implementing DLL based on LabVIEW below call Lib

  Here is the list of C functions in the doc that I have, but I don't get the right result.

  I need help to understand how these features and how to configure it in LabVIEW

  Parameters

  voltType
  [in] Specifies a voltage detector to get the value of. There may be flags
  VCORE (1<>
  V25 (1<>
  V33 (1<>
  V50 (1<>
  V120 (1<>
  VSB (1<>
  VBAT (1<>
  VN50 (1<>
  VN120 (1<>
  ATV (1<>
  retval
  [out] Points to a variable in which this function returns the voltage in volts.
  Typesupport
  [out]
  If the value is specified as a (non-NULL) pointer to a variable, it will return the types of sensors available in indicators at the level of the ILO-ORed
  Return value
  TRUE (1) indicates a success; FALSE (0) indicates a failure.
  Remarks
  Call the function first with a typesupport non-NULL of the sensors available fan and a subsequent call to get the required voltage.

  Thanks to all...!

  I solved this problem.

  There was a problem in the configuration of the VoltType. We have a cluster of bits.

  Here is the screenshot.